ASoC: pcm: Check for ops before deferencing them

Ensure that we always check that an ops structure is present before we
try to use it, improving the robustness of the system.

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 22 insertions, 21 deletions

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index d4498723b375..d81b79251760 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -190,7 +190,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 
         /* startup the audio subsystem */
-        if (cpu_dai->driver->ops->startup) {
+        if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
                 if (ret < 0) {
                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
@@ -208,7 +208,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
                 }
         }
 
-        if (codec_dai->driver->ops->startup) {
+        if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
                 if (ret < 0) {
                         dev_err(codec_dai->dev, "ASoC: can't open codec"
@@ -463,7 +463,7 @@ static int soc_pcm_prepare(struct snd_pcm_substream *substream)
                 }
         }
 
-        if (codec_dai->driver->ops->prepare) {
+        if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
                 if (ret < 0) {
                         dev_err(codec_dai->dev, "ASoC: DAI prepare error: %d\n",
@@ -472,7 +472,7 @@ static int soc_pcm_prepare(struct snd_pcm_substream *substream)
                 }
         }
 
-        if (cpu_dai->driver->ops->prepare) {
+        if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
                 if (ret < 0) {
                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
@@ -523,7 +523,7 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
                 }
         }
 
-        if (codec_dai->driver->ops->hw_params) {
+        if (codec_dai->driver->ops && codec_dai->driver->ops->hw_params) {
                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
                 if (ret < 0) {
                         dev_err(codec_dai->dev, "ASoC: can't set %s hw params:"
@@ -532,7 +532,7 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
                 }
         }
 
-        if (cpu_dai->driver->ops->hw_params) {
+        if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_params) {
                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
                 if (ret < 0) {
                         dev_err(cpu_dai->dev, "ASoC: %s hw params failed: %d\n",
@@ -559,11 +559,11 @@ out:
         return ret;
 
 platform_err:
-        if (cpu_dai->driver->ops->hw_free)
+        if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 
 interface_err:
-        if (codec_dai->driver->ops->hw_free)
+        if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 
 codec_err:
@@ -600,10 +600,10 @@ static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
                 platform->driver->ops->hw_free(substream);
 
         /* now free hw params for the DAIs  */
-        if (codec_dai->driver->ops->hw_free)
+        if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 
-        if (cpu_dai->driver->ops->hw_free)
+        if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 
         mutex_unlock(&rtd->pcm_mutex);
@@ -618,7 +618,7 @@ static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
         struct snd_soc_dai *codec_dai = rtd->codec_dai;
         int ret;
 
-        if (codec_dai->driver->ops->trigger) {
+        if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
                 if (ret < 0)
                         return ret;
@@ -630,7 +630,7 @@ static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
                         return ret;
         }
 
-        if (cpu_dai->driver->ops->trigger) {
+        if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
                 if (ret < 0)
                         return ret;
@@ -647,19 +647,20 @@ static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
         struct snd_soc_dai *codec_dai = rtd->codec_dai;
         int ret;
 
-        if (codec_dai->driver->ops->bespoke_trigger) {
+        if (codec_dai->driver->ops &&
+            codec_dai->driver->ops->bespoke_trigger) {
                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
                 if (ret < 0)
                         return ret;
         }
 
-        if (platform->driver->bespoke_trigger) {
+        if (platform->driver->ops && platform->driver->bespoke_trigger) {
                 ret = platform->driver->bespoke_trigger(substream, cmd);
                 if (ret < 0)
                         return ret;
         }
 
-        if (cpu_dai->driver->ops->bespoke_trigger) {
+        if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
                 if (ret < 0)
                         return ret;
@@ -684,10 +685,10 @@ static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
         if (platform->driver->ops && platform->driver->ops->pointer)
                 offset = platform->driver->ops->pointer(substream);
 
-        if (cpu_dai->driver->ops->delay)
+        if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 
-        if (codec_dai->driver->ops->delay)
+        if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 
         if (platform->driver->delay)
@@ -1673,7 +1674,7 @@ static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
         struct snd_soc_pcm_runtime *rtd = substream->private_data;
         struct snd_soc_platform *platform = rtd->platform;
 
-        if (platform->driver->ops->ioctl)
+        if (platform->driver->ops && platform->driver->ops->ioctl)
                 return platform->driver->ops->ioctl(substream, cmd, arg);
         return snd_pcm_lib_ioctl(substream, cmd, arg);
 }
@@ -1934,8 +1935,8 @@ int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
 
                 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
 
-                if (drv->ops->digital_mute && dai->playback_active)
-                                drv->ops->digital_mute(dai, mute);
+                if (drv->ops && drv->ops->digital_mute && dai->playback_active)
+                        drv->ops->digital_mute(dai, mute);
         }
 
         return 0;
@@ -2224,7 +2225,7 @@ EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
                 int cmd, struct snd_soc_platform *platform)
 {
-        if (platform->driver->ops->trigger)
+        if (platform->driver->ops && platform->driver->ops->trigger)
                 return platform->driver->ops->trigger(substream, cmd);
         return 0;
 }